Coefficient of Rolling Resistance Calculator

Understanding Rolling Resistance in Electrical Vehicles

Rolling resistance is a critical force opposing the motion when a wheel rolls on a surface. In electric vehicles and electrical engineering applications, determining the exact coefficient of rolling resistance (Crr) helps engineers calculate battery discharge rates, mechanical power requirements, and total motor torque demands under real-world operating environments.

Formula Used

The fundamental equation determining rolling resistance force ($F_r$) is expressed as:

$$F_r = C_{rr} \cdot N$$

Where $C_{rr}$ represents the dynamic coefficient of rolling resistance adjusted for tire pressure and temperature, and $N$ represents the normal force exerted by the vehicle mass on the surface ($N = m \cdot g \cdot \cos(\theta)$). The electrical power drawn from the system is subsequently calculated by dividing mechanical propulsion power by total drive and motor efficiencies.

How to Use This Calculator

• Input your precise vehicle mass, local gravity constants, and wheel dimensions in the first column.
• Specify travel speed, road inclination, and select the corresponding road surface profile in the second column.
• Enter your electrical system variables including pack voltage, ambient thermal conditions, and component efficiencies in the third column.
• Click the submit button to review dynamic results directly above the configuration interface.

Frequently Asked Questions